General projects: Processing of mechanical parts and components, sales of mechanical parts and components, manufacturing of pumps and vacuum equipment, sales of pumps and vacuum equipment, manufacturing of ordinary valves and plugs (excluding special equipment manufacturing), sales of valves and plugs; Manufacturing of metal structures, sales of metal products, manufacturing of specialized equipment (excluding licensed professional equipment manufacturing), sales of mechanical equipment, and industrial design services (except for projects that require approval according to law, business activities can be carried out independently with a business license in accordance with the law)